我的网站将管理两种语言，法语（默认语言）和荷兰语。在法语中，我认为我不需要在URL中显示语言参数，所以我想只显示荷兰语（例如myapp.com/nl/）。目前我的路由不能正常工作，不确定我是否正确使用lang参数。我是一个新手与CakePHP，所以我做了以下根据文档：
我觉得这里面有一个问题。

<?php if (!$this->request->getParam('lang')) : ?>
        <?= $this->Html->link('<i class="fas fa-globe"></i> Nederlands', ['lang' => 'nl'], ['class' => 'btn ms-lg-4 btn-primary btn-sm float-end float-lg-start mt-3 mt-lg-0', 'escape' => false]) ?>
<?php else : ?>
        <?= $this->Html->link('<i class="fas fa-globe"></i> Français', ['lang' => ''], ['class' => 'btn ms-lg-4 btn-primary btn-sm float-end float-lg-start mt-3 mt-lg-0', 'escape' => false]) ?>
<?php endif ?>

appController.php

public function beforeFilter(EventInterface $event) {
    # We check if we have a language set
    if ($this->request->getParam('lang')) {
        I18n::setLocale($this->request->getParam('lang'));
    } else {
        # If we don't have one, we will set the default one (in my case it's French)
        I18n::setLocale('fr');
    }
}

routes.php

$builder
    ->connect(
        '/',
        ['controller' => 'pages', 'action' => 'home']
    );

$builder
    ->connect(
        '{lang}/',
        ['controller' => 'pages', 'action' => 'home']
    )
    ->setPersist(['lang']);

$builder
    ->connect(
        '/{lang}/{controller}/{action}/*', 
        []
    )
    ->setPatterns([
        'lang' => '[a-z]{2}'
    ])
    ->setPersist(['lang']);

$builder
    ->connect(
        '/{lang}/{controller}/{action}/{id}', 
        []
    )
    ->setPatterns([
        'lang' => '[a-z]{2}',
        'id' => '\d+'
    ])
    ->setPersist(['lang'])
    ->setPass(['id']);

$builder
    ->connect(
        '/{lang}/{controller}/{action}/{slug}', 
        []
    )
    ->setPatterns([
        'lang' => '[a-z]{2}',
        'slug' => '[a-z0-9-_]+'
    ])
    ->setPersist(['lang'])
    ->setPass(['slug']);

谢谢你的帮助。